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injector

A technology of injectors, appliances, applied in the direction of machines/engines, chemical instruments and methods, exhaust gas treatment, etc.

Inactive Publication Date: 2015-09-16
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Challenges to the preceding embodiments of air-supported injectors are, inter alia, the preparation of the spray to start metering, the precise guidance of smaller quantities of reducing agent, the response characteristics of the injector and the ice compressive strength at low temperatures

Method used

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Experimental program
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Embodiment Construction

[0022] figure 1 A schematic cross-sectional view of an injector according to the invention is shown.

[0023] The injector 10 comprises, inter alia, an enclosure 12 received in a pot-shaped housing 14 or seat. A conical annular gap 16 is introduced into the enclosure 12 , which also tapers downwards towards the nozzle opening 18 . The geometric shape of the annular gap 16 corresponds to two conical sides arranged alternately, the generatrices of which do not run parallel to one another. The inner spacing between the conical sides increases steadily or linearly in the direction towards the nozzle opening 18 . For better illustration, two conical sides are depicted without reference numerals. A finely distributed spray of air and reducing agent, in particular 32.5% aqueous urea, exits the nozzle openings 18 . The spray not shown here has a preferably conical geometry. The numerical ratio between the lower (minimum) width 22 and the upper (maximum) width 20 of the annular ga...

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Abstract

The nozzle (10) has an enclosure body (12) accommodated in a housing (14) and comprising a circumferential annular gap (16) that opens into a nozzle orifice (18). A reducing agent and air are dispensed into the annular gap through throttles (34, 36) and air nozzles (30, 32), respectively. The annular gap is formed in cone-shape and tapers to the nozzle orifice that is surrounded by a ring bulge (24). A recess (40) is formed in housing for accommodating a cylindrical projection of the body. The body is made of a hydrophobic thermoplastic and / or duroplastic material i.e. PTFE.

Description

Background technique [0001] In vehicles utilizing internal combustion engines, especially diesel engines, atmospheric pollutants such as nitrogen oxides (NO x ). A known method for reducing nitrogen oxide emissions from diesel engines is selective catalyst reduction ("selective catalyst reduction"=SCR method). In this case, the reducing agent is conveyed by means of a pump from a storage container into an injector arranged in the exhaust system. The reducing agent is precisely metered and atomized with the finest atomization by injectors and injected into the exhaust gas flow. The amount of reducing agent injected into the exhaust gas flow is precisely adjusted here depending on the operating state of the internal combustion engine. Typically, about 32.5% aqueous urea is used as reducing agent, such as In order to increase the efficiency of the denitrification process, the quality of the spray produced by the injector is of great importance. [0002] Various injector con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/24B01D53/94
CPCF01N3/2066F01N2610/08Y02T10/24F01N2530/18F01N2610/1453Y02A50/20Y02T10/12
Inventor M·克鲁泽M·布劳恩
Owner ROBERT BOSCH GMBH